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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fecdc71578d4ab76e38951574e781ab6a72c9c598e560d76161d247a7d54a3f' 
  AND token = 'WJpCuPCS62m4XuTSSkEz/N5ztKoyQ2JriKr5x7Wx6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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