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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1205d2e0b49f9e6d357ffc5b03db1a5bd3902fec5fe16f7f5359ce3106e1b2ae' 
  AND token = 'Zewvj5sQs6ZdsVyPtl4rFRrutdFxphCTwW+KFhnVrT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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