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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec2f53cd3f52e6ff571deb6dd83cfcb611b291ba738251642ba838926793e7f' 
  AND token = '03AGNvlkqBnJ7MoK8OTEEdMJ2AlVrAm560vBz/CEezc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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