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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2ae2c70d9856527b9f2744e70abe36f92b6e7b45665b3406036a34ec603aa4' 
  AND token = 'yriQj+VKtw2H7S9SCrBP6+Lk/mim36wOnwyrxZSgv5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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