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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a55d25423c50c3dc7b5b9346d4d47d309b3edb5bbb7ec1c851b43233aa25f1' 
  AND token = 'QG2/NRRGzf4h3T5u67zWI3PPwM9Xn9dW4U1jzA5g5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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