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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4138adcf8a5431589ef1dd3799ff7d613f84d6d9535f688d096f95a59a27023' 
  AND token = 'c2rSeN/QvHo7lu1+wxYun5MGkM5tvjCh4+6RBYouOeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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