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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8130f0c772d61aa709495c1ec90f4c58579cfeaebf15eadab96f05055f0760' 
  AND token = 'Siw/JKonm8H2hEbKYy+z0K7x3CNt3WMy/h/z19562jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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