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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222664b43c926db274e651c199d187a642ea17a3cfb831bab5db7a5eb12d68a4' 
  AND token = 'QmDnOfIMRT86LnRkFCmbTHoY8XxwoeIWKJaFH3lg38c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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