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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bbb3661cfb9981aca499836f1f00155cc7e78d35afdbc7e31973e22b71a6f6' 
  AND token = 'tEemjAKW7Pe4Lhx5ds2Z0wZ0ox/Jk3qX6/t6saSbj0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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