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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba36a35c8d544ccc554a5230044a702cba42923f69730221720b8ead83f00a3' 
  AND token = 'hMpWJB90prf0aZl962knm93/UOPgFipaf4RRZqHxAWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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