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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83746316e31e44a2faf22d9abb55f87be8bfec4b9afa1c989cf6ee6f80334112' 
  AND token = '8987aZEP3XDCmwZDcmcdRIB7n46uxyGAr/AoUACRqkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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