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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0c33baf091a7de3c0efede43a776ee878fd0f879d3270573f478fc4f9409d0' 
  AND token = 'zO4MYQ6eOmqvuMucPbPO6G9EG6bz8DlHEqXTbbzAb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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