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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a018f916ca13bff8fd14ffda28cf94fb7a3b8165c068e62db3a3b9408a24221' 
  AND token = 'Okcx/NUjvHJpDXyOy9s0b1+/nrNS1qPOrdpcifTqjPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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