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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ad5820d0da599f6088abc38d004c4d8d09096a0090ee995e29ece6e5d80f89' 
  AND token = 'mgLXFZQADl+prAuI1RcxygPD2eJGhmKsRoO2LgLBf6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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