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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc2d051edb9cc4133d9d48a5b9c7fae01c4ad7a8cb1e3d8f3c8013187a12740' 
  AND token = 'XjK/0TRpUAwUwbbM5J/lKRgW5gFLsrOR61mYgbf13Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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