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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8691e258236008c218f8e7a7cdf8c3b8797d4524bafe0ff44c0f5bc261caa1d' 
  AND token = 'MqXk5ec8ylter5QTmhBDs/a/qI+Jg/hTVMJ9grxHTEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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