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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3e052516b9e5b20f54ce67c54805cf11d4bf6c3a3ab112fe4252519d3be4fb' 
  AND token = 'xbmYx47C2CWk7XeaNYPmGatVrk7zuj6g36eXEq8NW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00400

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}