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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49f00bf8d17f38c8a2b9971a216cd015f85bf07ae1a861e8dbe503d6777a4f3' 
  AND token = 'siWhjMGVshHO90JOhkom3bk7B6UTjzxCrSZnlqknN6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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