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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafe5d67c482314eb9e3a84d60dc13d94a3a958b55044d0f24935736aa566b66' 
  AND token = 'lMHy1vVDHKsUp9KquHoiN/22Oe2uEiPMKpm51wUi3Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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