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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb0e97c92d64cadb71541813db5ba53c39ac1cef05db4adc402c4435e6c6338' 
  AND token = 'RPg3jq+QM1uS2eKcKxrMA9x4CIr1pF4Bqeo1IMZ4ArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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