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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f8796a6eb1afd7fb0d75bba6db3eebb8e6e39888666efad9ce51517e1699b1' 
  AND token = 'FmF9P46yiJD7Dr8oAKBG6/HJnU5yGGdriL3D1iyitAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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