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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d76dbe274e214d8e15305ab9bbae1b9535ef789004928ab2b61d0ac94da4859' 
  AND token = 'd0WqJFARSkG+Qm/15Jt4Rgd25QYNSJkNktaPxjccQbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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