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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a71ac1b4b3627c488cd897fbf40a110efbacd9e3f3f26d1156fd9151ed1b72' 
  AND token = 'EkGNxdALPW18BGklztx6t9sqB1QDOGWWOpoT691JqK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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