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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300c3ac08eac9f96f545a58f85a6fd17b8641d5b956f211384a77c44d96a9793' 
  AND token = '1VC3ZX0Tz9XW8mXOk4El2ZB0sqjSwtG1Tfi2AD5+SRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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