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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313e97028ad914f6506a294159414ed2236e9d5142af12acccefaa2a757bb71b' 
  AND token = 'BChefhZcs5Obrdha5TVG5sMZts7UgKGx3kN+QYXR7lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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