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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0673f9c7b4e5a75a4dde2d5e88558e3c168714448a546bdac919e58ad5e26b6' 
  AND token = 'ztorbCs0NWOdUyAofeyVI6DkHjdNGH17+klviLxjjsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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