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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caa196ed3b99a9130028d2ae069f85975c21bd38ed2cbe0aef5720ea5987a6d' 
  AND token = 'y+Y+eX5eRZ2UkzE3NKj3MwI+kKRDF1LTDluF8NZS6oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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