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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6702b0e16c616f639755fade4654ad6c6c7233aff4782f73846bb73989731c' 
  AND token = 'iCxIwNa6s2iskSEAzAOjoDIbfdAuQZ7L/QSBZn/5AeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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