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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0abd49d4bbcc1d4b88080ad477c2f6d6251c5d5789a868b7bc79f8fd08753e6' 
  AND token = 'S3S9HFI1tZy7yJXsWxsdJZXUchujiz149LyPwHPq9qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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