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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f8e3dcf6694bcd54e7a30d712586aa28f3e4c3173196a6184ffb3af51b24ea' 
  AND token = 'U2RmwlVsW+ekS7HbeRSK7FBOE7xbjE5iNgpSmPEgJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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