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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0b4899576e6a6e5f9cc4fff5cc3932417b978098ffaf417db583ef598d9660' 
  AND token = '/KiHxA9juusSZAAbxSpWs7MCSZ1oeBlOvKx4EycmStE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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