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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77dc0b73641027ad2b46d03cba91ab8bd6148a7814f55300aa42213a0b1198e' 
  AND token = 'ZlcDyEfiMWtTQSWJDdn6fGzk6I0obXIaEkZXfe0XXIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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