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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ba5f8ce2b6138e54a7210c3091bbc0ead79348144110b74f0fe3af011ddc90' 
  AND token = 'pn+KmxnW2C9cM1vI0w4kw7OA8gY0TRLD5XMG90D1qD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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