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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a691894547e19f61b9263818b979527f973adc4a364bdeacf9bf078c64d7dab0' 
  AND token = 'a01KBqTgX6DK33QcMr7e6ujJR86ERd/DgHf8TLS8wlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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