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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8438466ee9da83add97cbf182051858c8998c43e94aad82815f9d576a6a96cfb' 
  AND token = 'zXxT1LdqiTIYoLhKv5d2cILTf6N+6jvgu1X2Mp1YEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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