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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417a4dcb9b4407409e8da04f5f12a74773da50e7ca3e4882c56d3ebfceb54993' 
  AND token = 'GV/J1HDpDM9jMJy7AZd4akCUYTyymX0afgSDPmoEyuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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