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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf514ced874b0e4428ba5c12590135aaaf99b202d011b473cbce3ff35847232' 
  AND token = 'ool+fR/m9MPnJ5cSN9FoprQ3LFg3gYYSUAD5Bwt/jC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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