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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff564e9add9769e09849e109792f6d096eff73f11e2298261fc0ac1f554c68e' 
  AND token = 'lINE6HG6rifPgy3lLZP+Xdr+q7m9ZP9DuROXq6TiMjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00338

JSON explain

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