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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccc9a6b9f71bc99495c39785bfea8a4b75555ef5005c9a80687c149671633b7' 
  AND token = 'qR1qne3AupPdEH0ezbbV5HQOk2/5kNAAPn/rstlY6YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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