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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b070c834429ed9fd28c4e01b0da4bc0078a3bc0db4b1d88a026d3335e60effc' 
  AND token = 'iIKk7GcFhhgD9JZUwGRWpySNZqthVn4rp+6pmMrlQuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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