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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bc8c4319ad35bee2b45fa3fb1cd08760d9f577a2ba1e7e73f6dafb24a9f279' 
  AND token = 'SCf6M2fIcJ1qXn6cOYQ7h7hjV9BpI2VnefPsJebk9OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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