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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd698219141125db9ba9e707eb0adf862d6fa5990f913fdd0e89a5f4fbfd3a2' 
  AND token = 'pBhL2Q68md8z4An82w6YlnTiEjFwG7lhBYjuxbicP/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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