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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0769b843a9b44ac12c5b84fbded70ae9f474e38cb3ee0ad28bfce872d34e48' 
  AND token = 'ZaAcJK+HgcPmtprKaAb5fn2G3zylobC0WBYUZgN1Bus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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