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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3f9f04654dc6652e25433b5faeb9f325ab7aed92a517b8549b0d94e612111a' 
  AND token = '/C0inHyHfUjJdRU9Zss/mbnk/BcnP+hrc1LCFAV8sts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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