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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3086be230a95258cf4ab2d6de6936a5f2eb5b4eb1e3f24695ed9c8f6867e27d' 
  AND token = 'Mv+TcfXj+XtwL9i5rzNQHONDpohTc3WIb5Bl3whYYHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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