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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0b345d853f9b4ee5ffbba8e399de7d4139fb322afd700143a60b8ad6a43072' 
  AND token = '6VZVm9ehcONaf1adx/ZmeMvILVRljS/v1jEh8Fwd0SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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