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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc5c69ea8d1262feaadafae967209b1b73966e6a3666a79f3bb165774cbf1f1' 
  AND token = 'JSPSwCWfby5tBCMLg1CcGVTeZz+ToCVeowm0DEszOfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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