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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85fd4fa1eeab5ca11a2d87337a79af9749afad250b2b4e77e2bff58f740efa9' 
  AND token = 'X8r7UL7DTRzjYkO6nPI6o2jIQlgr8s2t6yg3RYvkP2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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