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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cea71b366cb44f1003e0247887d708439d74b044d4e36819851472c434a1e30' 
  AND token = 'r2qmuEZuJW1ucGB8UwtNXjjsLczNPkTRXELWRKMgUGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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