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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cd4b542dee349d05c88851327188a28ef1a4b6481c5e0804546c6c36df9278' 
  AND token = 'KgOKb7hdbgW5e3Ch8R07aIO4BuKSA2xuB96QveOcp/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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