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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8b774cba5ff0bdf335d7e5f59132d4b97593dae4e7e4c037739c0424d42387' 
  AND token = '5HONLsbWDb/mRniKc+6ywypASOAUx5rq8JNaGUDwWxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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