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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9230d625405fa1665fd18255f59a9d0e315e97e0b394e621df9ea942f615ee' 
  AND token = 'flAAjiTr7mQLFsmVh5IswWQNOfLB9ciUZPHgRYCp1+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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