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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab792b02bf479f75dd9e271bb0d9b7b41ed9be4f532b11204786355a68afe3fb' 
  AND token = 'QJi0dWxaXyyGo3Nknw0rAc5S1x95JyEFQ52FIhDsa94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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