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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f671efe445b122044f5aa61803926d12eb3e6556348f80c04ff2c7d8de4909' 
  AND token = 'JRM5Vbq0pHgmPvBeM6Sasw6Mj/8TffCtEfaEGgqW128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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