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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c833f41bb4462874a9933aaef72606903d33418d806ddf993a7456104bf36bde' 
  AND token = 'SqQkLYmjCbK5QgYr/cXDjvPdoedadN6DAOHSE3fFuKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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