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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94be9723ca2638914c96e374bb03a079cbb349ec1646013bebca7437d7434e8f' 
  AND token = 'ik/P/7t3VGpwIMg11lbA26uKtd9z1zZZLiUSBUZakjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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