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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c110880d3b61f072d150b8432d9b62b5d2398fa4456aa095c8937fca7651505d' 
  AND token = 'ZtthPzkATq5I5oDP8Ir8MrBPI+cdSiAupq/vU9iLfrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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