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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e57db9808a9b725155205e282107557a4759cbdd2ac31be41ac5abd3e31261' 
  AND token = 'wFlXqHxTCafAk4I/K6JdKsT+X6AaVO7yTlssmJ4zf9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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