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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd2f8d8950af35d09c2d185c7498c71999de61ad91af685093da9f6fc5e10d1' 
  AND token = 'GIDpZQ7RbrrJ3CJ5Kyt3SlH8K4R/sfbbqDmomvDMVOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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