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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974f99a98efff28163505d3240a78fcd8bb211d4530fee7968f54e32bf8b4cb5' 
  AND token = '60hGamJ123s5oPe4zV/MLrcneiZrHrgXiScStMxGNRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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