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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913ce75b988e30981fa5d11a44ef5155e9ea1f6ca0011f71d7616ea2dea3765d' 
  AND token = 'wzjsfG2ltD0ANEDc6EJy+9ek8bbxvOngptJbSnbYPQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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