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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f999a3f8f60fa43501608f58000d3ff0218bc42bd0fa0da2528dd8a254ea22b9' 
  AND token = 'SBvfieZTBYEbAZqqYk6N5B+FCt6+DvZp0ioRa0aFdjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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