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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4344d82a5d89209b87f08f99c51bfb50826d3fbbf0ef684dc84e94fc861ec9c1' 
  AND token = 'ZWTy5/rggms20XTChm8408XtwPd1SQo5heGQiWDMA14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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